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Ecophysiological constraints on spore establishment in bryophytes
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
2004 (English)In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 18, no 6, 907-913 p.Article in journal (Refereed) Published
Abstract [en]

1.Many threatened bryophytes are restricted to patchy and temporary substrates suchas dead wood and tree stems. Their persistence depends on successful colonizations ofnew patches. Spore germination may then be limited by substrate quality and wetness.

2.In vitroexperiments were used to test the effects of pH and moisture on the establishmentof spores of the moss speciesNeckera pennataHedw. andBuxbaumia viridis(DC) Moug. & Nestl.

3.Low pH and water potential prolonged the lag phase preceding germination andreduced final germination. The interaction between pH and moisture suggests that highwater availability facilitates germination at suboptimal pH, andvice versa.

4.The results reflect the species’ habitats: the wood-inhabitingB. viridishad higher capacityto germinate at low pH, while spores of the epiphyteN. pennatashowed earlier germinationat low water potential and survived longer in a dry state. This supports the notionthat bryophytes are most strongly affected by substrate quality during establishment.

5.We suggest that a trade-off exists among moss spores between the ability to colonizesubstrates with low moisture-holding capacity and low pH, and that the positive effectof high pH is largely that it speeds up germination thereby enabling the spores toexploit short, moist periods.

Place, publisher, year, edition, pages
2004. Vol. 18, no 6, 907-913 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-91962DOI: 10.1111/j.0269-8463.2004.00906.xOAI: oai:DiVA.org:uu-91962DiVA: diva2:164880
Available from: 2004-09-02 Created: 2004-09-02 Last updated: 2013-05-17Bibliographically approved
In thesis
1. Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests
Open this publication in new window or tab >>Establishment, Growth and Population Dynamics in two Mosses of Old-growth Forests
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biodiversity in forests depends on long canopy continuity and existence of different elements which function as substrates for varying organisms. Bryophytes often occupy specific substrates with a patchy distribution. The aim of this thesis was to increase the ecological knowledge about two threatened moss species; Buxbaumia viridis, inhabiting decaying wood, and Neckera pennata, inhabiting bark of base-rich deciduous trees.

Establishment from spores was investigated in Buxbaumia viridis and Neckera pennata and models were created to predict germination of spores as a function of pH and water potential. The effects of pH, phosphorus and nitrogen concentration were studied in Buxbaumia viridis, both on spore germination and on sporophyte occurrences in the field. Colony growth in relation to precipitation and microhabitat variables was studied in Neckera pennata, and a model was used to predict growth of colonies over time. Metapopulation dynamics of Buxbaumia viridis were analyzed as an effect of precipitation, habitat quality and patch quantity. A spatial explicit patch occupancy model was constructed to simulate metapopulation sizes and extinction risk over 100 years.

The quality of the substrate was very important for spore establishment. Germination success increased with increasing pH in both species. Buxbaumia viridis was less sensitive to low pH than Neckera pennata when water was freely available. However, there was a strong interaction between pH and water potential in prediction of the final cumulative germination: the spores reacted positively to one factor only when the other factor was in a favourable range.

Precipitation, moisture holding capacity and interference competition were the main factors affecting colony growth of Neckera pennata. Buxbaumia viridis showed large fluctuations in number of occupied patches among years. Both colonizations and extinctions were highly related to precipitation. Spore germination and sporophyte occurrences in the field were positively related to phosphorus concentration and pH of the substrate.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 47 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 996
Biology, Buxbaumia viridis, Neckera pennata, bryophyte, pH, phosphorus, water potential, precipitation, metapopulation, environmental stochasticity, ecology, plant, Biologi
National Category
Biological Sciences
urn:nbn:se:uu:diva-4446 (URN)91-554-6006-2 (ISBN)
Public defence
2004-09-23, The lecture hall, Dept. of Plant Ecology, Villavägen 14, Uppsala, 10:00
Available from: 2004-09-02 Created: 2004-09-02Bibliographically approved

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